Book mark



FIG. 1 is a perspective view of the book mark with a book shown in broken lines representing environmental association matter being for illustrative purposes only and forming no part of the claimed invention.

FIG. 2 is a perspective view of the book mark.

FIG. 3 is a front elevational view thereof, the rear, left side, and right side elevational views being mirror images of the front view; and,

FIG. 4 is a top plan view of the book mark, the bottom plan view being a mirror image of the top plan view. 

The ornamental design for a book mark, as shown and described. 